From f2411da746985e60d4d087f3a43e271c61785927 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Mon, 30 Mar 2015 16:20:05 -0700 Subject: driver-core: add driver module asynchronous probe support Some init systems may wish to express the desire to have device drivers run their probe() code asynchronously. This implements support for this and allows userspace to request async probe as a preference through a generic shared device driver module parameter, async_probe. Implementation for async probe is supported through a module parameter given that since synchronous probe has been prevalent for years some userspace might exist which relies on the fact that the device driver will probe synchronously and the assumption that devices it provides will be immediately available after this. Signed-off-by: Luis R. Rodriguez Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- include/linux/module.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/module.h') diff --git a/include/linux/module.h b/include/linux/module.h index c883b86ea964..f46a47d3c0dc 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -257,6 +257,8 @@ struct module { bool sig_ok; #endif + bool async_probe_requested; + /* symbols that will be GPL-only in the near future. */ const struct kernel_symbol *gpl_future_syms; const unsigned long *gpl_future_crcs; -- cgit v1.2.3-58-ga151 From 80c6e1465948c2e91214f01764f427d31ebedb26 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Thu, 21 May 2015 15:49:37 -0700 Subject: driver-core: fix build for !CONFIG_MODULES Commit f2411da74698 ("driver-core: add driver module asynchronous probe support") broke build in case modules are disabled, because in this case "struct module" is not defined and we can't dereference it. Let's define module_requested_async_probing() helper and stub it out if modules are disabled. Reported-by: kbuild test robot Reported-by: Stephen Rothwell Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 2 +- include/linux/module.h | 11 +++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) (limited to 'include/linux/module.h') diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 42e97d90a59a..8da8e071f01d 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -427,7 +427,7 @@ bool driver_allows_async_probing(struct device_driver *drv) return false; default: - if (drv->owner && drv->owner->async_probe_requested) + if (module_requested_async_probing(drv->owner)) return true; return false; diff --git a/include/linux/module.h b/include/linux/module.h index f46a47d3c0dc..57f5c0a804c0 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -510,6 +510,11 @@ int unregister_module_notifier(struct notifier_block *nb); extern void print_modules(void); +static inline bool module_requested_async_probing(struct module *module) +{ + return module && module->async_probe_requested; +} + #else /* !CONFIG_MODULES... */ /* Given an address, look for it in the exception tables. */ @@ -620,6 +625,12 @@ static inline int unregister_module_notifier(struct notifier_block *nb) static inline void print_modules(void) { } + +static inline bool module_requested_async_probing(struct module *module) +{ + return false; +} + #endif /* CONFIG_MODULES */ #ifdef CONFIG_SYSFS -- cgit v1.2.3-58-ga151